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Convertible Senior Notes - Additional Information (Details)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 20, 2023
day
Oct. 31, 2021
USD ($)
shares
Feb. 01, 2021
USD ($)
Jan. 14, 2020
USD ($)
Jan. 31, 2020
USD ($)
Jul. 31, 2018
USD ($)
day
Jan. 31, 2022
USD ($)
day
$ / shares
Jan. 31, 2022
USD ($)
day
$ / shares
shares
Jan. 31, 2021
USD ($)
Jan. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]                        
Proceeds from borrowings on convertible senior notes, net of issuance costs         $ 1,130,000,000     $ 0 $ 0 $ 1,132,991,000    
Effective discount rate       5.04%                
Convertible debt, conversion ratio         4.7349 14.6738            
Convertible debt, conversion ratio denominator                     $ 1,000  
Initial conversion price (in dollars per share) | $ / shares             $ 211.20 $ 211.20     $ 68.15  
Carrying amount of convertible debt equity component           $ 84,200,000            
Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Temporary equity, period increase (decrease)     $ 4,700,000                  
Accumulated Deficit | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Stockholders' equity, period increase (decrease)     52,600,000                  
Additional Paid-In Capital | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Stockholders' equity, period increase (decrease)     309,400,000                  
2026 Notes                        
Debt Instrument [Line Items]                        
Long-term debt             $ 1,136,521,000 $ 1,136,521,000 886,919,000      
Debt issuance costs             13,467,000 13,467,000 13,174,000      
Fair value of convertible debt             2,200,000,000 2,200,000,000        
2024 Notes Partial Repurchase                        
Debt Instrument [Line Items]                        
Long-term debt       $ 160,619,000                
Debt issuance costs       3,623,000                
2024 Notes                        
Debt Instrument [Line Items]                        
Face amount of debt   $ 1,900,000                    
Long-term debt       229,459,000     0 0 73,276,000      
Debt issuance costs       5,175,000     $ 0 $ 0 $ 1,265,000      
Debt conversion, shares issued (in shares) | shares   27,377                    
Redemption Period 1                        
Debt Instrument [Line Items]                        
Consecutive threshold trading days | day           30 30 30        
Threshold percentage of stock price trigger           130.00% 130.00% 130.00%        
Redemption Period 1 | Forecast                        
Debt Instrument [Line Items]                        
Consecutive threshold trading days | day 30                      
Threshold percentage of stock price trigger 130.00%                      
Redemption Period 1 | Minimum                        
Debt Instrument [Line Items]                        
Threshold trading days | day           20 20 20        
Redemption Period 1 | Minimum | Forecast                        
Debt Instrument [Line Items]                        
Threshold trading days | day 20                      
Redemption Period 2                        
Debt Instrument [Line Items]                        
Convertible debt, conversion ratio denominator                     $ 1,000  
Threshold trading days | day           5            
Consecutive threshold trading days | day           5            
Redemption Period 2 | Maximum                        
Debt Instrument [Line Items]                        
Trading price as a percentage of stock price and debt conversion rate                     98.00%  
Convertible Debt                        
Debt Instrument [Line Items]                        
Face amount of debt       90,000,000             $ 50,000,000 $ 250,000,000
Interest rate                     0.75% 0.75%
Proceeds from borrowings on convertible senior notes, net of issuance costs       479,200,000   $ 291,100,000            
Convertible debt, conversion ratio denominator             $ 100 $ 100        
Percentage of principal amount redeemed           100.00%   100.00%        
Debt issuance costs                     $ 8,800,000  
Effective interest rate                     7.03%  
Convertible Debt | Forecast                        
Debt Instrument [Line Items]                        
Percentage of principal amount redeemed 100.00%                      
Convertible Debt | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Debt instrument, increase (decrease), net     $ 261,500,000                  
Convertible Debt | 2026 Notes                        
Debt Instrument [Line Items]                        
Face amount of debt             $ 1,000,000,000 $ 1,000,000,000        
Interest rate             0.25% 0.25%        
Carrying amount of convertible debt equity component       294,900,000                
Debt issuance costs             $ 20,300,000 $ 20,300,000        
Effective interest rate             5.60% 5.60%        
Net deferred tax liabilities             $ 700,000 $ 700,000        
Convertible Debt | Additional Convertible Senior Notes Due 2026                        
Debt Instrument [Line Items]                        
Face amount of debt             150,000,000 150,000,000        
Convertible Debt | 2024 Notes Partial Repurchase                        
Debt Instrument [Line Items]                        
Face amount of debt       210,000,000                
Convertible Debt | Convertible Senior Notes, Liability Component                        
Debt Instrument [Line Items]                        
Proceeds from borrowings on convertible senior notes, net of issuance costs       175,141,000                
Debt issuance costs                     $ 6,300,000  
Convertible Debt | Convertible Senior Notes, Equity Component                        
Debt Instrument [Line Items]                        
Proceeds from borrowings on convertible senior notes, net of issuance costs       303,900,000                
Debt issuance costs                     2,500,000  
Convertible Debt | Convertible Senior Notes, Interest Component                        
Debt Instrument [Line Items]                        
Proceeds from borrowings on convertible senior notes, net of issuance costs       $ 200,000                
Convertible Debt | Convertible Senior Notes Due 2026, Liability Component                        
Debt Instrument [Line Items]                        
Debt issuance costs             15,100,000 15,100,000        
Convertible Debt | Convertible Senior Notes Due 2026, Equity Component                        
Debt Instrument [Line Items]                        
Debt issuance costs             5,200,000 5,200,000        
Convertible Debt | Convertible Notes Due 2024 and 2026                        
Debt Instrument [Line Items]                        
Debt instrument, redeemed amount             90,000,000 90,000,000        
Repayments of convertible senior notes attributable to principal               $ 27,600,000        
Debt conversion, shares issued (in shares) | shares               1,243,706        
Equity                        
Debt Instrument [Line Items]                        
Carrying amount of convertible debt equity component                     $ 81,700,000  
Equity | Convertible Debt | 2026 Notes                        
Debt Instrument [Line Items]                        
Carrying amount of convertible debt equity component             $ 289,000,000 $ 289,000,000